package com.spzx.order.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.spzx.cart.api.RemoteCartService;
import com.spzx.cart.api.domain.CartInfo;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.utils.StringUtils;
import com.spzx.common.core.utils.bean.BeanUtils;
import com.spzx.common.rabbit.constant.MqConst;
import com.spzx.common.rabbit.service.RabbitService;
import com.spzx.common.security.utils.SecurityUtils;
import com.spzx.order.api.domain.OrderInfo;
import com.spzx.order.api.domain.OrderItem;
import com.spzx.order.api.domain.OrderLog;
import com.spzx.order.form.OrderForm;
import com.spzx.order.mapper.OrderInfoMapper;
import com.spzx.order.mapper.OrderItemMapper;
import com.spzx.order.mapper.OrderLogMapper;
import com.spzx.order.service.IOrderInfoService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.spzx.order.vo.TradeVo;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.RemoteSkuStockService;
import com.spzx.product.api.domain.ProductSkuVo;
import com.spzx.product.api.domain.SkuPriceVo;
import com.spzx.product.api.vo.SkuLockVo;
import com.spzx.user.api.RemoteUserAddressService;
import com.spzx.user.api.domain.UserAddress;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Primary;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * <p>
 * 订单 服务实现类
 * </p>
 *
 * @author xiongkunYang
 * @since 2025/05/29 18:13
 */
@Service
@Primary
@RequiredArgsConstructor
public class OrderInfoServiceImpl extends ServiceImpl<OrderInfoMapper, OrderInfo> implements IOrderInfoService {

    private final RemoteCartService remoteCartService;
    private final RedisTemplate<Object, Object> redisTemplate;
    private final RemoteProductService remoteProductService;
    private final RemoteUserAddressService remoteUserAddressService;
    private final OrderLogMapper orderLogMapper;
    private final OrderItemMapper orderItemMapper;
    private final RemoteSkuStockService remoteSkuStockService;
    private final RabbitService rabbitService;

    @Override
    public TradeVo orderTradeData() {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        R<List<CartInfo>> cartInfoListResult = remoteCartService.getCartCheckedList(SecurityConstants.INNER);
        if (R.FAIL == cartInfoListResult.getCode()) {
            throw new ServiceException(cartInfoListResult.getMsg());
        }
        List<CartInfo> cartInfoList = cartInfoListResult.getData();
        if (CollectionUtils.isEmpty(cartInfoList)) {
            throw new ServiceException("购物车无选中商品");
        }

        BigDecimal totalAmount = new BigDecimal(0);
        List<OrderItem> orderItemList = cartInfoList.stream().map(cartInfo -> {
            OrderItem orderItem = new OrderItem();
            BeanUtils.copyProperties(cartInfo, orderItem);
            return orderItem;
        }).toList();

        // 订单总金额
        for (OrderItem orderItem : orderItemList) {
            totalAmount = totalAmount.add(orderItem.getSkuPrice().multiply(new BigDecimal(orderItem.getSkuNum())));
        }

        //渲染订单确认页面-生成用户流水号（防止页面重复提交和页面等待超时）
        String tradeNo = this.generateTradeNo(userId);
        TradeVo tradeVo = new TradeVo();
        tradeVo.setTotalAmount(totalAmount);
        tradeVo.setOrderItemList(orderItemList);
        tradeVo.setTradeNo(tradeNo);
        return tradeVo;
    }

    @Transactional(rollbackFor = Exception.class)
    @Override
    public Long submitOrder(OrderForm orderForm) {

        //1 防止订单重复提交&防止页面停留超时
        //获取用户的userId
        Long userId = SecurityUtils.getUserId();
        String userTradeKey = "user:tradeNo:" + userId;
        // 将键的值更为 processed  表示已处理
        // return 1 表示处理成功
        // return -1  键存在但值不匹配，表示重复提交
        // return 0   键不存在，订单过期
        DefaultRedisScript<Long> redisScript = getRedisScript();
        long flag = redisTemplate.execute(redisScript, List.of(userTradeKey), orderForm.getTradeNo(), 3);
        if (flag == 0) {
            throw new ServiceException("操作超时，请退回重试");
        }
        if (flag == -1) {
            throw new ServiceException("请勿重复提交订单");
        }

        //2 判断价格是否改变并更新购物车中的商品价格
        // 2.1 批量获取商品实时价格
        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        List<Long> skuIdList = orderItemList.stream().map(OrderItem::getSkuId).collect(Collectors.toList());
        R<List<SkuPriceVo>> skuPriceListResult = remoteProductService.getSkuPriceList(skuIdList, SecurityConstants.INNER);
        if (R.FAIL == skuPriceListResult.getCode()) {
            throw new ServiceException(skuPriceListResult.getMsg());
        }
        List<SkuPriceVo> skuPriceVoList = skuPriceListResult.getData();

        // 2.2 并判断价格是否变更
        //O(n)
        StringBuilder priceCheckResult = new StringBuilder();
        //将列表转换成map
        Map<Long, BigDecimal> skuPriceMap = skuPriceVoList.stream()
                .collect(Collectors.toMap(SkuPriceVo::getSkuId, SkuPriceVo::getSalePrice));
        for (OrderItem orderItem : orderItemList) {
            if (orderItem.getSkuPrice().compareTo(skuPriceMap.get(orderItem.getSkuId())) != 0) {
                //价格发生了变化
                priceCheckResult.append(orderItem.getSkuName()).append("\n");
            }
        }

        // 2.3 如果有变更，则更新购物车中的商品价格
        if (StringUtils.hasText(priceCheckResult.toString())) {
            //非”立即购买“
            if (!orderForm.getIsBuy()) {
                //更新购物车中的价格
                R<Boolean> updateCartPriceResult = remoteCartService.updateCartPrice(userId, SecurityConstants.INNER);
                if (R.FAIL == updateCartPriceResult.getCode()) {
                    throw new ServiceException(updateCartPriceResult.getMsg());
                }
            }

            //如果价格有变更则中止下单
            throw new ServiceException("价格发生变化，请重新下单！\n" + priceCheckResult);
        }

        //3 校验库存并锁定库存
        List<SkuLockVo> skuLockVoList = orderItemList.stream().map(item -> {
            SkuLockVo skuLockVo = new SkuLockVo();
            skuLockVo.setSkuId(item.getSkuId());
            skuLockVo.setSkuNum(item.getSkuNum());
            return skuLockVo;
        }).collect(Collectors.toList());
        String checkAndLockResult = remoteSkuStockService.checkAndLock(
                orderForm.getTradeNo(),
                skuLockVoList,
                SecurityConstants.INNER).getData();
        if (StringUtils.isNotEmpty(checkAndLockResult)) {
            throw new ServiceException(checkAndLockResult);
        }

        //4 下单
        // 下单异常时需要解锁库存
        Long orderId;
        try {
            //下单
            orderId = this.saveOrder(orderForm);
        } catch (Exception e) {
            log.error("下单失败", e);
            //下单失败，解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderForm.getTradeNo());
            //抛出异常
            throw new ServiceException("下单失败");
        }

        //5 删除购物车选中商品
        if (!orderForm.getIsBuy()) {
            R<Boolean> deleteResult = remoteCartService.deleteCartCheckedList(userId, SecurityConstants.INNER);
            if (R.FAIL == deleteResult.getCode()) {
                log.error(deleteResult.getMsg());
                //非核心流程不影响程序的执行
                //throw new ServiceException(deleteResult.getMsg());
            }
        }

        return orderId;
    }

    @Override
    public TradeVo buy(Long skuId) {
        R<ProductSkuVo> productSkuVoResult = remoteProductService.getProductSku(skuId, SecurityConstants.INNER);
        if (R.FAIL == productSkuVoResult.getCode()) {
            throw new ServiceException(productSkuVoResult.getMsg());
        }
        ProductSkuVo productSkuVo = productSkuVoResult.getData();
        ArrayList<OrderItem> orderItemList = new ArrayList<>();
        OrderItem orderItem = new OrderItem();
        orderItem.setSkuId(skuId);
        orderItem.setSkuName(productSkuVo.getSkuName());
        orderItem.setThumbImg(productSkuVo.getThumbImg());
        orderItem.setSkuPrice(productSkuVo.getSalePrice());
        orderItem.setSkuNum(1);
        orderItemList.add(orderItem);

        TradeVo tradeVo = new TradeVo();
        tradeVo.setTotalAmount(productSkuVo.getSalePrice());
        tradeVo.setIsBuy(true);
        tradeVo.setOrderItemList(orderItemList);
        tradeVo.setTradeNo(generateTradeNo(SecurityUtils.getUserId()));
        return tradeVo;
    }

    @Override
    public List<OrderInfo> selectUserOrderInfoList(Integer orderStatus) {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();

        List<OrderInfo> orderInfoList = this.baseMapper.selectList(new LambdaQueryWrapper<OrderInfo>()
                .eq(OrderInfo::getUserId, userId)
                .eq(orderStatus != null, OrderInfo::getOrderStatus, orderStatus)
                .orderByDesc(OrderInfo::getCreateTime));

        if (!CollectionUtils.isEmpty(orderInfoList)) {
            List<Long> orderIdList = orderInfoList.stream()
                    .map(OrderInfo::getId)
                    .toList();
            List<OrderItem> orderItemList = this.orderItemMapper.selectList(new LambdaQueryWrapper<OrderItem>()
                    .in(OrderItem::getOrderId, orderIdList));
            Map<Long, List<OrderItem>> orderIdToOrderItemListMap = orderItemList.stream()
                    .collect(Collectors.groupingBy(OrderItem::getOrderId));
            //组装orderItemList
            orderInfoList.forEach(orderInfo ->
                    orderInfo.setOrderItemList(orderIdToOrderItemListMap.get(orderInfo.getId())));

        }
        return orderInfoList;
    }

    @Override
    public OrderInfo selectOrderInfoById(Long orderId) {
        LambdaQueryWrapper<OrderItem> queryWrapper = new LambdaQueryWrapper<OrderItem>()
                .eq(OrderItem::getOrderId, orderId);
        List<OrderItem> orderItemList = this.orderItemMapper.selectList(queryWrapper);

        OrderInfo orderInfo = this.baseMapper.selectById(orderId);
        orderInfo.setOrderItemList(orderItemList);
        return orderInfo;
    }

    @Override
    public void cancelOrder(Long orderId) {
        OrderInfo orderInfo = baseMapper.selectById(orderId);
        // 0,订单状态为待付款
        if (orderInfo != null && orderInfo.getOrderStatus() == 0) {
            // 修改订单状态为取消, -1
            orderInfo.setOrderStatus(-1);
            orderInfo.setCancelTime(new Date());
            orderInfo.setCancelReason("用户取消订单");
            baseMapper.updateById(orderInfo);
            //记录日志
            OrderLog orderLog = new OrderLog();
            orderLog.setOrderId(orderInfo.getId());
            orderLog.setProcessStatus(-1);
            orderLog.setNote("用户取消订单");
            orderLogMapper.insert(orderLog);
            //发送MQ消息通知商品系统解锁库存
            rabbitService.sendMessage(MqConst.EXCHANGE_PRODUCT, MqConst.ROUTING_UNLOCK, orderInfo.getOrderNo());
        }
    }

    @Override
    public OrderInfo getByOrderNo(String orderNo) {
        // 获取订单
        OrderInfo orderInfo = this.baseMapper.selectOne(new LambdaQueryWrapper<OrderInfo>()
                .eq(OrderInfo::getOrderNo, orderNo));
        // 获取订单详情
        List<OrderItem> orderItemList = orderItemMapper.selectList(new LambdaQueryWrapper<OrderItem>()
                .eq(OrderItem::getOrderId, orderInfo.getId()));
        orderInfo.setOrderItemList(orderItemList);
        return orderInfo;
    }

    @Override
    public void processPaySuccess(String orderNo) {
        //获取订单信息
        OrderInfo orderInfo = baseMapper.selectOne(
                new LambdaQueryWrapper<OrderInfo>()
                        .eq(OrderInfo::getOrderNo, orderNo)
        );

        //幂等判断
        if(orderInfo.getOrderStatus() == 1){
            return;
        }
        orderInfo.setOrderStatus(1);
        orderInfo.setPaymentTime(new Date());
        baseMapper.updateById(orderInfo);
    }


    /**
     * 获取用于处理特定逻辑的Redis脚本对象
     * 该方法编写的Lua脚本主要用于处理以下逻辑：
     * 1. 如果给定键的值等于提供的参数值，则将该键的值设置为'processed'，并设置过期时间
     * 2. 如果给定键的值不等于提供的参数值，检查键是否存在：
     * - 如果键存在，返回-1
     * - 如果键不存在，返回0
     *
     * @return DefaultRedisScript<Long> 初始化的Redis脚本对象，包含脚本文本和结果类型
     */
    private static DefaultRedisScript<Long> getRedisScript() {
        // Lua脚本文本，实现了上述逻辑
        String scriptText = """
                if redis.call('get', KEYS[1]) == ARGV[1] then
                       redis.call('set', KEYS[1], 'processed', 'ex', ARGV[2])
                       return 1
                   else
                   	if redis.call('exists', KEYS[1]) == 1 then
                           return -1
                       else
                       	return 0
                       end
                   end
                """;

        // 创建一个空的Redis脚本对象
        DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();

        // 设置脚本的文本内容
        redisScript.setScriptText(scriptText);

        // 设置脚本执行结果的类型
        redisScript.setResultType(Long.class);

        // 返回初始化后的Redis脚本对象
        return redisScript;
    }


    private Long saveOrder(OrderForm orderForm) {
        Long userId = SecurityUtils.getUserId();
        String userName = SecurityUtils.getUsername();

        // 保存订单记录：order_info
        OrderInfo orderInfo = new OrderInfo();
        orderInfo.setUserId(userId);
        //订单号
        orderInfo.setOrderNo(orderForm.getTradeNo());
        orderInfo.setNickName(userName);
        orderInfo.setRemark(orderForm.getRemark());
        orderInfo.setFeightFee(orderForm.getFeightFee());

        //远程调用获取用户地址信息
        R<UserAddress> userAddressResult = remoteUserAddressService.getUserAddress(orderForm.getUserAddressId(), SecurityConstants.INNER);
        if (R.FAIL == userAddressResult.getCode()) {
            throw new ServiceException(userAddressResult.getMsg());
        }
        //获取用户地址信息
        UserAddress userAddress = userAddressResult.getData();
        //保存用户地址信息
        orderInfo.setReceiverName(userAddress.getName());
        orderInfo.setReceiverPhone(userAddress.getPhone());
        orderInfo.setReceiverTagName(userAddress.getTagName());
        orderInfo.setReceiverProvince(userAddress.getProvinceCode());
        orderInfo.setReceiverCity(userAddress.getCityCode());
        orderInfo.setReceiverDistrict(userAddress.getDistrictCode());
        orderInfo.setReceiverAddress(userAddress.getFullAddress());

        //实时获取总价格
        //计算orderItem中商品的总价格
        List<OrderItem> orderItemList = orderForm.getOrderItemList();
        BigDecimal totalAmount = orderItemList
                .stream()
                .map(
                        orderItem -> orderItem
                                .getSkuPrice()
                                .multiply(new BigDecimal(orderItem.getSkuNum()))
                )
                .reduce(BigDecimal.ZERO, BigDecimal::add);
        //设置商品总价格
        //原价
        orderInfo.setOriginalTotalAmount(totalAmount);
        //优惠券价格
        orderInfo.setCouponAmount(new BigDecimal(0));
        orderInfo.setTotalAmount(totalAmount);
        //订单状态
        // 0, 待付款
        orderInfo.setOrderStatus(0);

        orderInfo.setCreateBy(userName);
        orderInfo.setUpdateBy(userName);
        baseMapper.insert(orderInfo);

        // 保存订单项记录：order_item
        for (OrderItem orderItem : orderItemList) {
            orderItem.setOrderId(orderInfo.getId());
            orderItem.setCreateBy(userName);
            orderItem.setUpdateBy(userName);
            orderItemMapper.insert(orderItem);
        }

        // 保存订单日志记录：order_log
        OrderLog orderLog = new OrderLog();
        orderLog.setOrderId(orderInfo.getId());
        orderLog.setProcessStatus(0);
        orderLog.setOperateUser(userName);
        orderLog.setNote("提交订单");
        orderLog.setCreateBy(userName);
        orderLog.setUpdateBy(userName);
        orderLogMapper.insert(orderLog);

        return orderInfo.getId();
    }

    /**
     * 渲染订单确认页面-生成用户流水号
     *
     * @param userId 会员id
     * @return 订单流水号
     */
    private String generateTradeNo(Long userId) {
        //1.构建流水号Key
        String userTradeKey = "user:tradeNo:" + userId;
        //2.构建流水号value
        String tradeNo = UUID.randomUUID().toString().replaceAll("-", "");
        //3.将流水号存入Redis 暂存5分钟
        redisTemplate.opsForValue().set(userTradeKey, tradeNo, 5, TimeUnit.MINUTES);
        return tradeNo;
    }
}
